PDRP-1001 Datasheet, PDF (38/56 Pages) Systemsensor advanced ideas. – Deluge - Preaction Control Panel

Appendix A: Secondary Power Calculations
Calculating the Battery Capacity
Calculating the Battery Capacity
Use this table to determine the battery capacity required by the system.
Standby Battery Current
Required Standby Time in Hours
(from Table 1)
[ ] amps
(typically 24¹, 60² or 90³ hours)
X _{[ ] hrs}
=
Enter:
0.25 for 5 minutes in alarm, or
0.50 for 10 minutes in alarm
Total Standby and Alarm Load +
Standby
Amp Hours
Alarm⁴
Amp Hours
Multiply by derating factor X
1.2
Battery size required in AH =
1. NFPA 72 Central Station and Local and Proprietary Fire Alarm Systems require 24 hours of standby time.
2. NFPA 72 Auxiliary and Remote Station Fire Alarm Systems require 60 hours of standby time.
3. Factory Mutual Systems require 90 hours of standby for preaction and deluge sprinkler systems.
4. Alarm AH assumes a maximum system draw of 3 amps in alarm for 5 minutes (0.25 AH) or for 10 minutes (0.5AH).
Table 2 Amp Hour Calculations
The battery charger in this panel will charge a maximum of 18 AH of batteries within 48 hours (7 AH
minimum). Batteries larger than 12 AH will require a UL-listed battery cabinet (e.g. BB-17).
Select a battery with an equal or greater AH rating than the value obtained in the table above.
Note: Batteries must be lead-acid type.
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PDRP-1001 Instruction Manual PN 50734:D0 04/06/01